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For each domain in the SNOMED CT concept model, the the |MRCM domain reference set| will  will contain exactly one member. This reference set member will include an Expression Constraint that defines the concepts in the domain, the identifier of the immediate the immediate parent domain (or domains), the domain constraint defined in terms of its proximal primitive concepts and associated mandatory refinements, a generic Domain Expression Template for both precoordinated and postcoordinated content Footnote MacroNote: It , and a reference to the associated Editorial Guidance that provides additional human-readable text describing this domain. Please note that it is anticipated that the generic Domain Expression Templates will be specialized further for authoring of specific subdomains using specializations of the generic Domain Expression Template stored in a Template Library.

To ensure consistency with the rules defined in the |MRCM attribute domain reference set| and the |MRCM attribute range reference set|, the generic Domain Expression Templates should never be edited directly. Instead, and a reference to the associated Editorial Guidance that provides additional human-readable text describing this domainchanges should be made by editing the associated rules in the |MRCM attribute domain reference set| and the |MRCM attribute range reference set| and then updates to the generic Domain Expression Templates automatically made.

Data Structure

An |MRCM domain reference set| is structured as shown in the following table.

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